linux-kernel - Re: [PATCH v1 2/8] block: make 'struct bvec_iter' not depend on CONFIG

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Date:	Wed, 30 Mar 2016 10:19:27 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org,
	linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Anton Altaparmakov <anton@...era.com>, xfs@....sgi.com,
	Dave Chinner <david@...morbit.com>, drbd-dev@...ts.linbit.com,
	Philipp Reisner <philipp.reisner@...bit.com>,
	Lars Ellenberg <lars.ellenberg@...bit.com>,
	Boaz Harrosh <boaz@...xistor.com>
Subject: Re: [PATCH v1 2/8] block: make 'struct bvec_iter' not depend on
 CONFIG_BLOCK

On Thu, Mar 31, 2016 at 12:17:11AM +0800, Ming Lei wrote:
> We will use bvec iterator to implement iterate_bvec(): lib/iov_iter.c.
> 
> Reviewed-by: Christoph Hellwig <hch@....de>
> Signed-off-by: Ming Lei <ming.lei@...onical.com>
> ---
>  include/linux/blk_types.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
> index 86a38ea..fd8527b 100644
> --- a/include/linux/blk_types.h
> +++ b/include/linux/blk_types.h
> @@ -26,8 +26,6 @@ struct bio_vec {
>  	unsigned int	bv_offset;
>  };
>  
> -#ifdef CONFIG_BLOCK
> -
>  struct bvec_iter {
>  	sector_t		bi_sector;	/* device address in 512 byte
>  						   sectors */
> @@ -39,6 +37,8 @@ struct bvec_iter {
>  						   current bvec */
>  };

I didn't catch this earlier, but shouldn't this also move to
bvec_iter.h? Or maybe just create a linux/bvec.h for the bvec, bvec_iter
and bvec iter macros given that those are the types used outside the
block layer as well.